Anybody have a source for the metal bushing that goes thru the hole in the fello for the inner tube stem?
Noah Stutzman used copper tubing to make the ones on my wheels. I'm assuming a flaring tool would get you started.
Don't know if it's what you are looking for but I bought plastic bushings a couple of years ago for my 27 with wood wheels. I used rubber stem tubes so needed the bushings so the valve stems wouldn't move and get damaged. They are in the Mac's catalog, part #16-53884-1 (T-1500RB)
Tom is right, but you need a rolling die instead of a flare tool to form the ends of the bushing. Stutzmann uses 5/8" copper tubing which has a 1/2" inner hole to fit the modern incorrectly sized valve stems that are now available. Rolling dies are part of double flaring kits, but it seems crazy to buy a whole double flaring kit if you are only going to use one tool in the box.
If you have a lathe, or know someone with a lathe, it is an easy procedure to make a rolling die to form the end of the tubing.